A felicitous but unproved conjecture may be of much more…

You should not put too much trust in any unproved conjecture, even if it has been propounded by a great authority, even if it…

— George Polya

The development of mathematics toward greater precision has led, as is well known, to the formalization of large tracts of it, so that one…

— Kurt Gödel

A mathematician experiments, amasses information, makes a conjecture, finds out that it does not work, gets confused and then tries to recover. A good…

— Steven G. Krantz

“In science's pecking order, evolutionary biology lurks somewhere near the bottom, far closer to phrenology than to physics. For evolutionary biology is a historical…

— Jerry A. Coyne

“Fundamental values (such as equality and human rights) should not be held hostage to some factual conjecture about blank slates that might be refuted…

— Stephen Pinker

We have to learn again that science without contact with experiments is an enterprise which is likely to go completely astray into imaginary conjecture.

— Hannes Alfven

“Now Aristotle says that the judgment which follows knowledge is in truth faith. Accordingly, faith is something superior to knowledge, and is its criterion.…

— Clement of Alexandria

Physiognomy is not a guide that has been given us by which to judge of the character of men: it may only serve us…

— Jean de la Bruyere

I shall not mingle conjectures with certainties.

— Isaac Newton

I think everybody handles things very differently and you can conjecture, but until you're put in that situation, you really don't know.

— Laura Linney

The artist may be well advised to keep his work to himself till it is completed, because no one can readily help him or…

— Johann Wolfgang von Goethe

Rumour is a pipe Blown by surmises, jealousies, conjectures And of so easy and so plain a stop That the blunt monster with uncounted…

— William Shakespeare

From the almost total absence of fossil evidence relative to the origin of the phyla, it follows that any explanation of the mechanism in…

— Pierre-Paul Grasse

The classes of problems which are respectively known and not known to have good algorithms are of great theoretical interest. [...] I conjecture that…

— Jack Edmonds

But there are times when men have serious thoughts, and it is at such times, when they begin to think, that they begin to…

— Thomas Paine